Which examples show repair or replacement of damaged cells? 1. a scrape being healed. 2. scars forming where a cut once belonged. 3. skin flaking off your arm in the winter.

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.